Description
LBB 1920/00 Plena Universal Pre-Amplifier
Four universal low-noise input channels for microphone or line
Separate tone control, speech filter and direct output per channel
Selectable blocking, serial and mixing priorities
Multifunctional inter-connection point
Priority and emergency relay outputs
Master volume control
The Plena Pre-Amplifier is a versatile, high-performance unit
with four mono-input channels. It fulfills a wide variety of
public address requirements at a surprisingly low cost.
Functions
All input channels provide the choice of a balanced 3‑pin
XLR-connector for microphone or line level (selectable), a
balanced 5‑pin DIN-connector for microphone or line level
with priority contact, or a line level stereo cinch-connector,
converted to mono. Microphone inputs have a phantom
power supply. Each input channel has its own volume and
tone control, a selectable speech filter to reduce the bass
content of the speech signal for improved intelligibility, and
a balanced, direct output on XLR, that bypasses the channel
controls.
Three priority modes are available for the input channels. In
blocking mode the input channel that is activated first gets
priority over all other input channels. In serial mode input
channel 1 has priority over channels 2, 3 and 4; channel 2
has priority over channels 3 and 4; and channel 3 has
priority over channel 4. Each of the input channels can be
mixed to the master output, irrespective of priority, by
separately setting that channel to the mixing mode.
Balanced XLR interconnection input and output are
provided in combination with an insertion/cascade
selector. In insertion mode an external sound processing
device, e.g. an equalizer, can be connected between these
connections. In the cascade mode, multiple LBB1920/00
pre-amplifiers can be cascaded to increase the number of
input channels to 8, 12, or even more. Internally the
interconnection input can be switched as an emergency
input with a signal level detector (VOX). If an emergency
audio signal is detected, this channel overrides all others.
The emergency input channel has its own volume preset
and bypasses the master volume control.
For the emergency input another VOX activated relay is
provided to trigger external equipment or for local volume
control override. An overload protected 24 VDC output
provides power for driving external relays, making an
external power supply unnecessary.
An additional microphone level output is available on the
DIN connector, parallel to the balanced XLR master output.
This provides an input signal for a mixing desk or a
microphone input channel for a mixer amplifier, such as the
Plena LBB 19xx/10. A tape output is also available.
The master output channel, or one of the input channels,
can be selected to be monitored with headphone connector
and LED meter.
Specification - ***View PDF File for more information***
Bosch BOSCH LBB192000 PLENA UNIVERSAL PRE AMPLIFIER - 701000024
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